Exclusive: 'Brave' short film 'The Legend of Mor'du' preview - watch

Pixar's latest movie Brave debuts on Blu-ray and DVD on November 26, with a special short film as part of the home release package.

The Legend of Mor'du delves into the backstory of Brave's ferocious bear, who in his previous life was a prince who sought to gain control of his family's kingdom.

Watch an exclusive preview of The Legend of Mor'du below:

Mor'du director Brian Larsen, a storyboard artist on Pixar's Ratatouille, told Digital Spy of the film: "You get the entire backstory of the demon bear Mor'du. You get little bits and pieces throughout the film, and then in the short we go deeper to discover what steps happened, and how he actually becomes a bear, and you get to see really what he has done.

"So it's a cautionary tale, and it mirrors Merida's story - there's a kingdom and there's four brothers and the kingdom is falling, in kind of the exact same way that Merida's story is playing out."

Larsen added of Mor'du's distinct visual style: "We called it like a moving graphic, and what really intrigued me about it is, since it was a story being told, we really wanted to give it its own little look, as if it was somebody's imagination.

"I love the painterly style, I always love the art... the development artwork that goes into movies, but you never really see them unless you buy the book. So I wanted to say, let's make a short where those paintings are the main focus of the piece.

"It just gave us this ancient look, and made us feel like we were just a little bit further away from Brave, in the sense that it doesn't necessarily feel too real."